CI: drop deprecated ubuntu-18.04

.github/workflows/test.yml

@@ -14,6 +14,9 @@ jobs:
     steps:
       - name: Check out Git repository
         uses: actions/checkout@v4
+      - if: startsWith(matrix.os, 'ubuntu')
+        name: lxd should be installed
+        run: "/snap/bin/lxd version"
       - name: Snapcraft should not be installed
         shell: bash
         run: "! snapcraft --version"
@@ -67,22 +70,3 @@ jobs:
         run: |
           snap info snapcraft
           grep -Eq 'tracking:\s+latest/candidate' <(snap info snapcraft)
-
-  # Install with lxd
-  lxd:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, ubuntu-18.04]
-    steps:
-      - name: Check out Git repository
-        uses: actions/checkout@v4
-      - if: matrix.os == 'ubuntu-18.04'
-        name: lxd should not be available
-        run: "! /snap/bin/lxd waitready"
-      - name: Run action
-        uses: ./
-        with:
-          use_lxd: ${{ matrix.os == 'ubuntu-18.04' }}
-      - name: lxd should be installed
-        run: "/snap/bin/lxd version"

README.md

@@ -6,7 +6,7 @@
 
 This action…
 
-- Installs Snapcraft on Ubuntu 18.04+/macOS
+- Installs Snapcraft on Ubuntu/macOS
 - Optionally logs you in to the Snap Store
 - Allows you to run Snapcraft commands in your GitHub Actions workflows
 
@@ -86,13 +86,11 @@ Finally, add the following option to your workflow step:
 
 ### Build using LXD
 
-Using `runs-on: ubuntu-20.04` or later, LXD is availabe by default. If using `runs-on: ubuntu-18.04`, LXD can be installed as shown below. This is an alternative to using `multipass` (GitHub VMs give the error `launch failed: CPU does not support KVM extensions.` when trying to use `multipass`).
+Using `runs-on: ubuntu-20.04` or later, LXD is availabe by default.
 
 ```yml
 - name: Install Snapcraft with LXD
   uses: samuelmeuli/action-snapcraft@v3
-  with:
-    use_lxd: ${{ matrix.os == 'ubuntu-18.04' }}
 - name: Build snap
   run: sg lxd -c 'snapcraft --use-lxd'
 ```

action.yml

@@ -11,10 +11,10 @@ inputs:
     description: Skip installation (login only)
     required: false
   use_lxd:
-    description: Whether to install and configure lxd (ubuntu18.04 or lower only)
+    description: Whether to install and configure lxd
     required: false
     # tag: deprecate_use_lxd
-    deprecationMessage: On ubuntu20.04 or later, it's enabled by default
+    deprecationMessage: automatic on ubuntu-20.04 or later
 
 runs:
   using: node20